Authors
P Allison, S Archambault, JJ Beatty, DZ Besson, A Bishop, CC Chen, CH Chen, P Chen, YC Chen, BA Clark, W Clay, A Connolly, L Cremonesi, P Dasgupta, J Davies, S De Kockere, KD De Vries, C Deaconu, MA DuVernois, J Flaherty, E Friedman, R Gaior, J Hanson, N Harty, B Hendricks, KD Hoffman, E Hong, SY Hsu, L Hu, JJ Huang, M-H Huang, K Hughes, A Ishihara, A Karle, JL Kelley, K-C Kim, M-C Kim, I Kravchenko, R Krebs, Y Ku, CY Kuo, K Kurusu, H Landsman, UA Latif, C-J Li, T-C Liu, M-Y Lu, B Madison, K Madison, K Mase, T Meures, J Nam, RJ Nichol, G Nir, A Novikov, A Nozdrina, E Oberla, J Osborn, Y Pan, C Pfendner, N Punsuebsay, J Roth, D Seckel, MFH Seikh, Y-S Shiao, A Shultz, D Smith, S Toscano, J Torres, J Touart, N Van Eijndhoven, GS Varner, A Vieregg, M-Z Wang, S-H Wang, YH Wang, SA Wissel, C Xie, S Yoshida, R Young, (ARA Collaboration)
Publication date
2022/6/15
Journal
Physical Review D
Volume
105
Issue
12
Pages
122006
Publisher
American Physical Society
Description
In the pursuit of the measurement of the still-elusive ultrahigh-energy (UHE) neutrino flux at energies of order EeV, detectors using the in-ice Askaryan radio technique have increasingly targeted lower trigger thresholds. This has led to improved trigger-level sensitivity to UHE neutrinos. Working with data collected by the Askaryan Radio Array (ARA), we search for neutrino candidates at the lowest threshold achieved to date, leading to improved analysis-level sensitivities. A neutrino search on a data set with 208.7 days of livetime from the reduced-threshold fifth ARA station is performed, achieving a 68% analysis efficiency over all energies on a simulated mixed-composition neutrino flux with an expected background of events passing the analysis. We observe one event passing our analysis and proceed to set a neutrino flux limit using a Feldman-Cousins construction. We show that the improved trigger …
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P Allison, S Archambault, JJ Beatty, DZ Besson… - Physical Review D, 2022